Ａ：Remember arithmetic, which you learned in elementary school.
It had been established by the time of the ancient Greeks. We use addition, subtraction, multiplication, and division for money calculation in shopping.
We also imagine the shape of the road map when we walk along a street or drive a car, and we look for a short cut.
You can leave calculation to a cashier when shopping, but you might be charged a terrible amount.
The arithmetic you learned in elementary school is indispensable for everyday life.

Meanwhile, the mathematics studied at junior high school and after serves as a foundation of science.
Modern society stands based on developed science and technology.
The essence of science lies in treating natural phenomena quantitatively, and a tool for quantitative treatment is mathematics.
Mathematics has a key role as a "language to describe science."
In addition, you can acquire competence in logical thinking by studying mathematics;
your efforts to solve mathematical problems will be useful for training your imagination for problem-solving in society in the future.